For heroic wote you could easily carry one guy, it's mostly execution based and as long as you do it properly the number requirement isn't that high. Sha is on an entirely different level, I suppose it miiight be possible for the very best guilds but assuming that said person is largely useless it'd be extremly difficult.

Don't see why not as long as he just sits on the boss as much as possible and hits him. DPS shouldn't be too bad that way. You could also just tell him what to attack. Basically, with an average ilvl 490, his dps should be sufficient to allow carrying provided he's pointed in the right direction as much as possible. I'm not 100% sure on the tactics for the heroic version of the fight, but if the concern is the enrage timer, then having him just sit on the boss should solve the issue.

Don't see why not as long as he just sits on the boss as much as possible and hits him. DPS shouldn't be too bad that way. You could also just tell him what to attack. Basically, with an average ilvl 490, his dps should be sufficient to allow carrying provided he's pointed in the right direction as much as possible. I'm not 100% sure on the tactics for the heroic version of the fight, but if the concern is the enrage timer, then having him just sit on the boss should solve the issue.

We could carry people through everything but Sha of Fear on heroic. 10 man Sha is impossible to carry an idiot/weak player at this time with our current gear levels UNLESS you play the buyer's character.

Will of the Emporer most definitely, our first kill came with someone dead for about 75% of the fight.
Empress also would be simple, we've even done it with 3 tanks just to reduce the chance of a tank getting gibbed, so dps requirement on that one is also low.
Sha would be a lot more tricky, especially in p1, just b/c of how cackles would work, you'd have 2 dps on the boss while the rest are away killing the archer, so pushing him would take a bit longer, and at some point you might be overcome by the adds flinging the bolts at you. You would need stellar DPS from everyone, including tanks, and an atonement priest wouldn't hurt either, but even with all that, i'm not convinced you could do it. In phase 2 if they were still alive (doubtful), you would either want them to die asap, or not ever break them out of huddles just so ball passing wouldn't become an issue.